135913523 has 4 divisors (see below), whose sum is σ = 135941400. Its totient is φ = 135885648.

The previous prime is 135913511. The next prime is 135913541. The reversal of 135913523 is 325319531.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 135913523 - 2¹⁸ = 135651379 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 135913523.

It is not an unprimeable number, because it can be changed into a prime (135913553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4490 + ... + 17087.

It is an arithmetic number, because the mean of its divisors is an integer number (33985350).

Almost surely, 2^135913523 is an apocalyptic number.

135913523 is a deficient number, since it is larger than the sum of its proper divisors (27877).

135913523 is an equidigital number, since it uses as much as digits as its factorization.

135913523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27876.

The product of its digits is 12150, while the sum is 32.

The square root of 135913523 is about 11658.1955293261. The cubic root of 135913523 is about 514.1472966297.

The spelling of 135913523 in words is "one hundred thirty-five million, nine hundred thirteen thousand, five hundred twenty-three".